Emerson Fisher C1 Instruction Manual page 25

Instruction Manual
D103292X012
Provide a process pressure source capable of simulating the process pressure range of the transmitter. If an output
pressure gauge is not provided, install a suitable pressure gauge for calibration purposes. Connect a pressure source to
the supply pressure regulator and be sure the regulator is delivering the correct supply pressure to the transmitter.
Note
For stability, some transmitter applications will require additional volume than just the gauge. Provide a minimum volume of
3
approximately 25 cm (1.5 in
Unless otherwise indicated, key number locations are shown in figure 11.
1. Complete the above connections and provide a process pressure equal to the sensing element range.
2. Rotate the span adjustment knob to the maximum setting on the dial (100 percent span).
3. Verify that the calibration adjuster screws (key 48) are at mid-position in the calibration adjuster (key 36) slots.
Depending upon the transmitter action, perform one or the other of the following procedures.
For reverse-acting transmitters:
4. Rotate the zero adjustment knob to zero.
5. Apply an input pressure equal to the sensing element upper range limit.
6. Adjust the nozzle (key 57) until the transmitter output pressure is at 0.2 bar (3 psig).
7. Set the input pressure equal to zero.
Note
Proper transmitter response depends on nozzle-to-flapper alignment.
When performing the span adjustment in step 8, carefully loosen both calibration adjuster screws while holding the calibration
adjuster in place. Then move the calibration adjuster slightly in the required direction by hand or using a screwdriver. Verify proper
nozzle-to-flapper alignment and hold the calibration adjuster in place while tightening both adjustment screws.
8. If the output pressure is not 15 psig, adjust the span by loosening the two adjusting screws (key 48) and moving the
calibration adjuster (key 36) a small distance as indicated in figure 12.
9. Repeat steps 4 through 8 until no further adjustment is necessary.
10. Proceed to the startup procedure for transmitters.
3
) or greater if stability is a problem.
C1 Controllers and Transmitters
March 2017
25